Techniques for selective use of light-sensing devices in light-based communication

• US 9,680,571 B2
• Filed: 12/18/2014
• Issued: 06/13/2017
• Est. Priority Date: 03/25/2014
• Status: Active Grant

• Current Assignee: OSRAM Sylvania Inc. (Ams-Osram AG)
• Original Assignee: OSRAM Sylvania Inc. (Ams-Osram AG)
• Inventors: Breuer, Christian, Aggarwal, Anant, Stout, Barry
• Primary Examiner(s): Li, Shi K
• Application Number:
  US14/575,536
• Publication Number:
  US 20150280823A1
• Time in Patent Office: 908 Days
• CPC Class Codes: H04B 10/1149 Arrangements for indoor wireless networking of information
• CPC Class Codes: H04B 10/116 Visible light communication
• CPC Class Codes: H04B 10/616 Details of the electronic signal processing in coherent optical receivers
• CPC Class Codes: H04L 7/0075 with photonic or optical means
• CPC Class Codes: H04W 4/02 Services making use of location information

Abstract

Techniques are disclosed for selective use of light-sensing devices in light-based communication (LCom). In accordance with some embodiments, the disclosed techniques can be used, for example, in determining how and when to utilize a given light-sensitive device, such as a camera or an ambient light sensor, of a receiver device for purposes of detecting the pulsing light of LCom signals transmitted by an LCom-enabled luminaire. In accordance with some embodiments, determination of whether to utilize only a camera, only an ambient light sensor, or a combination thereof in gathering LCom data may be based, in part or in whole, on factors including time, location, and/or context. In some cases, improvements in system resource usage may be realized using the disclosed techniques.

Claims

1. A light-based communication method comprising:

detecting, via a first light-sensing device of a mobile computing device, a pulsing light signal encoded with data, the detecting being done at a first sampling rate; and

decoding first data from the pulsing light signal detected at the first sampling rate;

detecting, via a second light-sensing device of the mobile computing device, the pulsing light signal encoded with data, the detecting being done at a second sampling rate different from the first sampling rate;

decoding second data from the pulsing light signal detected at the second sampling rate;

wherein the first data is used at least in part to determine at least one of when and how to utilize the second data.

2. The method of claim 1 wherein the first light-sensing device is a camera and the first data is used to orient the mobile computing device with respect to a light source providing the pulsing light signal encoded with data, and the second light-sensing device is a light meter used to interpret the data encoded in the pulsing light signal.

3. The method of claim 1, wherein one of the first and second light-sensing devices comprises an image capture device and the other of the first and second light-sensing devices comprises an ambient light sensor.

4. The method of claim 1, further comprising:

disabling at least one of the first light-sensing device and the second light-sensing device of the mobile computing device after the detecting by the at least one of the first light-sensing device and the second light-sensing device.

5. The method of claim 1, wherein the method comprises continuously performing at least one of the detecting by the first light-sensing device and the detecting by the second light-sensing device.

6. The method of claim 1, wherein the method comprises consecutively performing the detecting by the first light-sensing device and the detecting by the second light-sensing device.

7. The method of claim 1, wherein the method comprises simultaneously performing the detecting by the first light-sensing device and the detecting by the second light-sensing device.

8. The method of claim 1, wherein at least one of the first and second sampling rates is 300 Hz or greater.

9. The method of claim 1, wherein the first and second data are at least partially duplicative of one another.

10. The method of claim 1, further comprising:

determining a position of the mobile computing device relative to a source solid-state luminaire transmitting the pulsing light signal encoded with data.

11. The method of claim 1, wherein the detecting via the first light-sensing device and the detecting via the second light sensing-device is performed periodically.

12. The method of claim 1, further comprising:

spatially resolving the mobile computing device with respect to a source solid-state luminaire transmitting the pulsing light signal encoded with data, based on information capture by the first light-sensing device.

13. The method of claim 1, further comprising:

capturing an image via the first light-sensing device,

segmenting the image into a plurality of non-overlapping cells, where the pulsing light signal encoded with data is associated with a unique pixel cluster of a light source captured in at least one of the cells; and

spatially resolving the pulsing light signal encoded with data based on detected unique pixel clusters in the image.

14. The method of claim 1, wherein the first light-sensing device is a camera and the second light-sensing device is a light meter, and an ambient light level detected by the light meter is utilized to control an exposure setting of the camera.

15. A mobile computing device comprising:

a first light-sensing device configured to detect a pulsing light signal encoded with data, the detection at a first sampling rate;

a second light-sensing device configured to detect the pulsing light signal encoded with data, the detection at a second sampling rate different from the first sampling rate; and

a processor configured to decode the pulsing light signal detected at the first sampling rate to produce first data, decode the pulsing light signal detected at the second sampling rate to produce second data, and analyze the first data and the second data for purposes of receiving light-based communications transmitted in a given area;

wherein the first data is used at least in part to determine at least one of when and how to utilize the second data.

16. The computing device of claim 15, wherein one of the first and second light-sensing devices comprises an image capture device and the other of the first and second light-sensing devices comprises an ambient light sensor.

17. The computing device of claim 15, wherein at least one of the first and second sampling rates is 300 Hz or greater.

18. A light-based communication system comprising:

the mobile computing device of claim 15; and

a solid-state luminaire configured to transmit the pulsing light signal encoded with data.

19. A non-transitory computer program product encoded with instructions that, when executed by one or more processors, causes a process to be carried out, the process comprising:

decoding data from a pulsing light signal encoded with the data, the pulsing light signal captured via a first light-sensing device at a first sampling rate to produce first data; and

decoding data from the pulsing light signal encoded with the data, the pulsing light signal captured via a second light-sensing device at a second sampling rate different from the first sampling rate, to produce second data;

wherein the first data is used at least in part to determine at least one of when and how to utilize the second data.

20. The non-transitory computer program product of claim 19, wherein the decoding is carried out in accordance with a decoding scheme that is complementary to an encoding scheme with which the pulsing light signal was encoded with the data.

21. The non-transitory computer program product of claim 19, wherein the first data is used to spatially resolve a mobile computing device with respect to a luminaire transmitting the pulsing light signal, and the second data provides the data encoded in the pulsing light signal.